package org.bouncycastle.asn1.x509;

import org.bouncycastle.asn1.ASN1Choice;
import org.bouncycastle.asn1.ASN1Encodable;
import org.bouncycastle.asn1.ASN1Sequence;
import org.bouncycastle.asn1.ASN1TaggedObject;
import org.bouncycastle.asn1.DERObject;
import org.bouncycastle.asn1.DERTaggedObject;

public class AttCertIssuer extends ASN1Encodable implements ASN1Choice {
    ASN1Encodable obj;
    DERObject choiceObj;

    public static AttCertIssuer getInstance(Object obj) {
        if (obj instanceof AttCertIssuer) {
            return (AttCertIssuer) obj;
        } else if (obj instanceof V2Form) {
            return new AttCertIssuer(V2Form.getInstance(obj));
        } else if (obj instanceof GeneralNames) {
            return new AttCertIssuer((GeneralNames) obj);
        } else if (obj instanceof ASN1TaggedObject) {
            return new AttCertIssuer(V2Form.getInstance((ASN1TaggedObject) obj, false));
        } else if (obj instanceof ASN1Sequence) {
            return new AttCertIssuer(GeneralNames.getInstance(obj));
        }

        throw new IllegalArgumentException("unknown object in factory: " + obj.getClass());
    }

    public static AttCertIssuer getInstance(ASN1TaggedObject obj, boolean explicit) {
        return getInstance(obj.getObject()); // must be explictly tagged
    }

    /**
     * Don't use this one if you are trying to be RFC 3281 compliant. Use it for v1 attribute certificates only.
     * 
     * @param names
     *            our GeneralNames structure
     */
    public AttCertIssuer(GeneralNames names) {
        obj = names;
        choiceObj = obj.getDERObject();
    }

    public AttCertIssuer(V2Form v2Form) {
        obj = v2Form;
        choiceObj = new DERTaggedObject(false, 0, obj);
    }

    public ASN1Encodable getIssuer() {
        return obj;
    }

    /**
     * Produce an object suitable for an ASN1OutputStream.
     * 
     * <pre>
     *  AttCertIssuer ::= CHOICE {
     *       v1Form   GeneralNames,  -- MUST NOT be used in this
     *                               -- profile
     *       v2Form   [0] V2Form     -- v2 only
     *  }
     * </pre>
     */
    public DERObject toASN1Object() {
        return choiceObj;
    }
}
